A bar magnet of magnetic moment M⃗ is placed in a magnetic field B⃗. Which vector expression represents the magnetic torque on it?
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A bar magnet of magnetic moment M⃗ is placed in a magnetic field B⃗. Which vector expression represents the magnetic torque on it?

G1 Physics · Accepted Answer

Step 1: A bar magnet behaves like a magnetic dipole with moment M⃗. Step 2: For an applied magnetic field B⃗, the two pole forces form a couple whose torque direction follows the right-hand rule. Step 3: The torque is τ⃗ = M⃗ × B⃗, magnitude MBsinθ. Final: option C. Final answer: (C) M⃗ × B⃗.